Smoke-consuming furnace.



J. F. NIESER.

I SMOKE GONSUMING FURNACE.

APPLICATION IILED JAN. 26, 1911. 1,000,751. Patented Aug. 15,1911.

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J. F. NIBSER.

SMOKE OONSUMING FURNACE.

APPLICATION FILED JAN. 26, 1911.

1,000,751. Patented Aug. 15, 1911.

2 SHEETSSHEET 2.

I um/"15oz SMOKE-CONSUMING- FURNACE.

Specification of Letters Patent.

Application filed. January 26, 1911.

Serial No. 604,821.

To all whom it may concern:

Be it known that I, JOSEPH F. Nmsnn, citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Smoke-Consuming Furnaces, of which the following is a specification.

This invention relates to smoke consuming furnaces, and especially to that class thereof in which air and steam are fed into the combustion chamber, over the grate, for the purpose of combining with and consuming the carbon particles arising from the fuel.

The object of the invention is to improve such furnaces with respect to the means for supplying air and steam to the fire; also with respect to the means for preheating the steam discharged into the combustion chamber, so that it will be delivered dry, instead of wet.

A further object is to improve the construction of the devices for supplying air, the steam nozzle acting to assist the flow of air through a box which conducts the air from the space below-the grate to the fire above the same.

With these and other objects in view the invention is illustrated in the accompanying drawings in which Figure 1 is a front elevation, partly in section, of the furnace. Fig. 2 is a horizontal section through the ash pit. Fig. 3

is a detail in section of the steam nozzle. Fig. 4 is a front view thereof.

Referring specifically to the drawings, 6 indicates the furnace wall or casing, a boiler being indicated at 7, suitably supported therein. The grate is shown at 9, fire box at 10 and ash pit at 11. The bridge wall 12 at the rear of the fire box is built up toward the boiler shell, witha segmental top, with the intent to retard to a certain extent the flow of furnace gases, in order to give time for the unconsumedcarbon to unite with the air and steam which is injected into the fire box, over the fuel bed.

The steam is derived from a pipe 13, which will be connected to the main steam line and which is extended by two valved branches 14 through the rear furnace space 15 behind the bridge wall, and into the ash pit near the opposite side walls thereof. The purpose of this is to enable the steam to be heated and dried in the pipes 14, before it passes to the nozzles. The pipes 14 terminate at the front end in swiveling drain pipes 16, which may be swung down to permit condensation to flow into the ash pit. Each pipe 14 has a plurality of branches 17 each of which is connected to a steam passage 18 in an angular box 19 which is set in the furnace wall. The box has a main air passage 20 which opens at its lower end into the ash pit and at its upper end into the fire box, above the grate. The steam passage 18 is connected at the top by a nipple 21 to anozzle 22. This nozzle consists of a hollow head or chamber provided with radial ribs or flanges 23 and a line of jet holes 24 in the face thereof, said jet holes being arranged in a horizontal line so as to give a series of jets distributed over part of the fire box. The flanges 23 rest againstthe edges of the box at the open upper end thereof and serve to hold the nozzle in proper position, and a flow of air is permitted around allsides of the nozzle from the air passage in the box. The air is heated by flowing along the steam passage and nozzle and is distributed in a mixture with the steam, over the fuel. It is desirable to draw the air from the ash pit, because it is in heated condition, and the relatively short and large air passages through the boxes insure a free flow and full supply of said air into the fire box, whereby the format-ion of smoke incident to an insufficient supply of air through the grate bars is prevented, the steam blast assisting in supplying the amount of oxygen necessary to produce perfect combustion.

The boxes are preferably arranged in staggered relation at opposite sides of the fire box, as indicated in Fig. 2, so that the air and steam will be distributed over the whole surface of the fuel bed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is In a furnace, the combination with the fire box and ash pit of an air box set in the Fatented Aug. 15, 1911.

fire box wall, said air box having a steam supply pipe connected to the lower end of passage formed along one wall thereof, and said passage.

an opening at the bottom into the ash pit In testimony whereof, I do aflix my signaand an opening at the top into the fire box, ture in presence of two witnesses.

a steam nozzle located in the latter opening JOSEPH F. NIESER. i and having spaced ribs projecting toward Witnesses:

the edges of said openings, said nozzle being JOHN A. BOMMHARDT,

connected to the said passage, and a steam J. B. DANS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

